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@einen gisten getraut @fitta HUGH B. WILLS-ON, OF N EW YORK, N. Y.

Letters .Patent No. 72,142,0Zated December 10, 1867; anteclated November28, 1.867. i

' IMPROVEMENT INVENTILATING lIUNNBLS.

TO ALL WHOM IT MAY CONCERN: Beit known that I, HUGH BowLBY WILLsoN, ofthe city and county of New York., in the State of New York, haveinvented a new and improved Method of Ventilating Railway-Tunnelsconstructed underneath the streets or other parts of cities and towns;and I do hereby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings,making a part of the speciication', in whieh A represents across-section of a. street-railway tunnel." i Y l -B B the columns forreceiving and discharging the air in the manner hereinafterspeciiethwhich columns it is intended shall be substituted for the lampand awning-posts before in use, and which may beapplied to any otheruse, or for ornament and l f l C C are the pipes connecting alternatelywith the top and bottom, o'rother part of vsuch tunnels, the former narrangement being preferred. i i

` The nature of r my invention consists in erecting over or near theouter walls of suchrailway-tunnels hollow columns orpillars,constructe'd of iron or other suitable material, and connectingthe same on the opposite sides of the tunnel, alternately o r otherwise,with the top and bottom, by means of pipes constructed of any` suitablematerial, which columns and their connecting pipes may be placed 'asnear to each other -as may he deemed necessary to4 secure adequateventilation.. v

When such railway-tunnels run underneath a street, the columns Inlay bemade highly ornamental, and being 4 placed on the sidewalks, near thecurb-stones, may be and are intended to be substituted for.` lamp-postsand awning or other posts.

The openings for the ingress, o'f fresh air, and the escape of foul orvitiatedair, may be madeat the bases of the columns, as shown in thedrawings, or, the columns being carried up of a sulcient size, andbeinglholloww the openings may be made at the capitals or tops, justbelow the lamps in the case of lamp-posts.

l I do not confine or` limitv myself to any particular size, form, orheight of column,`or Ventilating lamp, awning, or other post applicableto the purposes of Ventilating;railway-tunnels in manner specified, norto any particular material for their construction, or of theconnecting-tubes, nor do I claim as new the construction of hollow'lamp, awning, or other posts, pillars, or structures; but

What I do claim as my invention and improvement, is- V 1. The method ofapply-ing street-lamp posts, and awning and other usi'ul or ornamentalposts, pillars, or structures to the purposes of Ventilating undergroundrailway-tunnels, substantially as within described.

2. I claim thecombination of street-lamp posts, and awning and otherposts, pillars, or structures, whether for ornament or usc, with theconnecting-tubes of such railway-tunnels, substantially in manner setforth. H UGH B. WILLSON.

Witnesses: l JOHN Sessions, JOHN S. RAY.

